| 摘要 |
1,149,345. Electron guns. SONY CORP. 25 April, 1966 [26 April, 1965], No. 17911/66. Heading H1D. An electron gun, especially for a colour television tube of the " Chromatron " (Registered Trade Mark) type, comprises a tetrode system in which the aperture of the accelerating electrode G2 has a diameter d 2 at least twice, and preferably four times, the diameter d 1 of the aperture of the control grid G 1 . The main convergence system is a unipotential lens G 3 , G 4 , G 5 and both the accelerator electrode G 2 and focusing electrode G 4 are grounded to serve as conductors for spurious discharges. The diameters d 3 , d 3 <SP>1</SP> of the apertures of first high voltage electrode G 3 are about twice the diameter d 1 and the diameter d 5 of the aperture of the second high voltage electrode G 5 is about three times d 1 . Specific dimensions are given. A pre-focusing convex lens is produced between accelerator electrode G 2 and first high voltage electrode G 3 and a concave lens in the vicinity of the aperture h 3 , the overall effect of the two lenses being weakly convex to assist prefocusing and to reduce spherical aberration. |
